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我尝试使用 LuaXml 库。但是它的功能是有限的，因为它只返回特定属性的第一个子表，并且不会更进一步。然后我尝试了字符串模式匹配，它有效，但我走到了死胡同，它无法完全完成任务。LuaExpat 库存在于我的 lua 的 lib 文件夹中，并且还有一个名为 lom.lua 的文件。但通常它不起作用或给我“找不到模块”的错误

我的 XML 文件如下所示：

<Service>
<NewInstance ref="5A">
<Std>DiscoveredElement</Std>
<Key>5A</Key>
<Attributes>
<Attribute name="TARGET_TYPE" value="weblogic_cluster" />
<Attribute name="DISCOVERED_NAME" value="/Farm_soa4_sys20_soa4_domain/soa4_domain/WSM4_Cluster" />
<Attribute name="BROKEN_REASON" value="0" />
<Attribute name="TARGET_NAME" value="/Farm_soa4_sys20_soa4_domain/soa4_domain/WSM4_Cluster" />
<Attribute name="EMD_URL" value="https://uxsys460.schneider.com:3872/emd/main/" />
</Attributes>
</NewInstance>

<NewInstance ref="6C">
<Std>DiscoveredElement</Std>
<Key>6C</Key>
<Attributes>
<Attribute name="TARGET_TYPE" value="oracle_weblogic_nodemanager" />
<Attribute name="SERVICE_TYPE" value=" " />
<Attribute name="ORG_ID" value="0" />
<Attribute name="TARGET_NAME" value="Oracle WebLogic NodeManager-uxlab090" />
</Attributes>
</NewInstance>

<NewInstance ref="98">
<Std>DiscoveredElement</Std>
<Key>98</Key>
<Attributes>
<Attribute name="TARGET_TYPE" value="composite" />
<Attribute name="SERVICE_TYPE" value=" " />
<Attribute name="TARGET_NAME" value="SYS-IMG-Grp" />
<Attribute name="EMD_URL" value="" />
</Attributes>
</NewInstance>

<NewRelationship>
<Parent>
<Instance ref="98" />
</Parent>
<GenericRelations>
<Relations type="contains">
<Instance ref="5A" />
</Relations>
</GenericRelations>
</NewRelationship>

<NewRelationship>
<Parent>
<Instance ref="5A" />
</Parent>
<GenericRelations>
<Relations type="contains">
<Instance ref="6C" />
</Relations>
</GenericRelations>
</NewRelationship>
<NewRelationship>
<Parent>
<Instance ref="5A" />
</Parent>
<GenericRelations>
<Relations type="contains">
<Instance ref="98" />
</Relations>
</GenericRelations>
</NewRelationship>
</Service>

我的议程是显示一个 NewInstance ID 及其相应的目标类型和目标名称，以及它的关系类型和实例 ref 的 ID，以及它的目标类型和目标名称，例如：

NewInstance ID - 5A
Target Type - weblogic_cluster 
Target Name - /Farm_soa4_sys20_soa4_domain/soa4_domain/WSM4_Cluster
Relation Type - contains
Instance ref - 6C
Target Type - oracle_weblogic_nodemanager
Target Name - Oracle WebLogic NodeManager-uxlab090
Instance ref - 98
Target Type - composite
Target Name - SYS-IMG-Grp

现在 LuaXml 不能用来实现这一点。我将在下面列出字符串模式匹配的代码，它可以帮助我完成任务直到关系类型但不准确

代码是：

a={}
b={}
c={}
d={}
p=0
i=0
q=0

local file = io.open("oem_topology_output.xml", "rb")   -- Open file   for    reading (binary data)
  for instance in file:read("*a"):gmatch("<NewInstance ref=\"(.-)\">") do
     a[i] = instance
     i = i+1
  end
file:close()
local files = io.open("oem_topology_output.xml", "rb")   -- Open file for  reading (binary data)
  for instances in files:read("*a"):gmatch("<NewInstance ref=\".-\">(.-)</NewInstance>") do
     TARGET_TYPE = instances:match('TARGET_TYPE.-value="(.-)"')
     TARGET_NAME = instances:match('TARGET_NAME.-value="(.-)"')
     b[p] = TARGET_TYPE
     c[p] = TARGET_NAME
     p =p+1
  end
local file = io.open("oem_topology_output.xml", "rb")   -- Open file   for   reading (binary data)
  for type in file:read("*a"):gmatch("<Relations type=\"(.-)\">") do
    d[q] = type
    q = q+1
  end
files:close()
for j=0,i-1 do
print("INSTANCE ID : ", a[j])
print("TARGET TYPE : ", b[j])
print("TARGET NAME : ", c[j])
print("RELATION TYPE : ",d[j])
end

请建议我应该遵循什么方法才能以所需的方式解析 XMl 文件。哪个内置库将提供 apt 功能。如果您提出建议，LuaExpat 让我知道它对我不起作用的可能原因。

4

2 回答 2

1

你不需要任何特殊的库来解析 lua 中的 xml，有很多内置的功能可以编写你自己的解析器。

例如，要检索节点的属性，您可以编写类似这样的内容。

local file = "oem_topology_output.xml"
local node = "<(%a-)%s* "
local attributes = {
    "ref",
    "name",
    "value",
    "type"
}


for line in io.lines(file) do
    for a in line:gmatch(node) do
        for x = 1, #attributes do
            n = line:match(attributes[x]..'="(.-)"')
            if n then
                print(a, attributes[x], n)
            end
        end
    end
end

产生类似的输出

NewInstance ref 5A
Attribute   name    TARGET_TYPE
Attribute   value   weblogic_cluster
Attribute   name    DISCOVERED_NAME
Attribute   value   /Farm_soa4_sys20_soa4_domain/soa4_domain/WSM4_Cluster
Attribute   name    BROKEN_REASON
Attribute   value   0
Attribute   name    TARGET_NAME
Attribute   value   /Farm_soa4_sys20_soa4_domain/soa4_domain/WSM4_Cluster
Attribute   name    EMD_URL
Attribute   value   https://uxsys460.schneider.com:3872/emd/main/
NewInstance ref 6C
Attribute   name    TARGET_TYPE
Attribute   value   oracle_weblogic_nodemanager
Attribute   name    SERVICE_TYPE
Attribute   value    
Attribute   name    ORG_ID
Attribute   value   0
Attribute   name    TARGET_NAME
Attribute   value   Oracle WebLogic NodeManager-uxlab090
NewInstance ref 98
Attribute   name    TARGET_TYPE
Attribute   value   composite
Attribute   name    SERVICE_TYPE
Attribute   value    
Attribute   name    TARGET_NAME
Attribute   value   SYS-IMG-Grp
Attribute   name    EMD_URL
Attribute   value   
Instance    ref 98
Relations   type    contains
Instance    ref 5A
Instance    ref 5A
Relations   type    contains
Instance    ref 6C
Instance    ref 5A
Relations   type    contains
Instance    ref 98

无需打开或关闭文件，因为没有写入的意图。

于 2016-08-07T08:40:35.770 回答
0 
local a, b, c, d = {}, {}, {}, {}

local h = io.open("oem_topology_output.xml", "rb")   
if not h then return end
local txt = h:read("*a")
h:close()

for ref, instances in txt:gmatch('<NewInstance ref="(%w+)">(.-)</NewInstance>') do
    a[#a+1] = ref   
    TARGET_TYPE = instances:match('name="TARGET_TYPE"%s+value="(.-)"')
    if TARGET_TYPE then b[#b+1] = TARGET_TYPE end
    TARGET_NAME = instances:match('name="TARGET_NAME"%s+value="(.-)"')
    if TARGET_NAME then  c[#c+1] = TARGET_NAME end
end

for relationship in txt:gmatch('<NewRelationship>(.-)</NewRelationship>') do
    parent = relationship:match('<Parent>.-ref="(%w+)".-</Parent>')
    node = relationship:match('<Relations type="contains">.-ref="(%w+)".-</Relations>')
    if parent and node then    d[#d+1] = {  [parent] = node } end
end

for j=1,#a do
   local id = a[j]
    print("INSTANCE ID : ", id)
    print("TARGET TYPE : ", b[j])
    print("TARGET NAME : ", c[j])
    for k,v in  pairs(d) do
        if type(v)=='table' and v[id] then
            print("\tRELATION: ",v[id])
        end
    end
end

输出：

INSTANCE ID :   5A
TARGET TYPE :   weblogic_cluster
TARGET NAME :   /Farm_soa4_sys20_soa4_domain/soa4_domain/WSM4_Cluster
    RELATION:   6C
    RELATION:   98
INSTANCE ID :   6C
TARGET TYPE :   oracle_weblogic_nodemanager
TARGET NAME :   Oracle WebLogic NodeManager-uxlab090
INSTANCE ID :   98
TARGET TYPE :   composite
TARGET NAME :   SYS-IMG-Grp
    RELATION:   5A
于 2017-02-28T09:10:54.920 回答